The cold bonding balls are a kind of refractory material which are made by sintering natural clay, forsterite, andalusite and other minerals into a compact shape at high temperatures. The cold bonding balls are usually used to contain combustion gases or other high temperature process gases, and can be used in high temperature furnaces, steel making vessels and other applications.
It is essential to have high quality cold bonding balls in order to ensure a safe and efficient operation. The most important factor in the quality of cold bonding balls is their resilience. This depends largely on the density and the shape of the ball. The high temperature process will cause a certain amount of expansion or compression of the cold bonding ball, so it needs to be resilient enough to withstand this change without cracking.
The cold bonding balls are generally divided into two main types – high density and medium density balls. The high temperature process conditions determine the core material used for the ball, with forsterite and andalusite being the most popular. These materials have good thermal properties, high melting points and good thermal shock resistance.
The sintering process for producing the cold bonding balls is essentially the same regardless of ball type. First, the cores are placed in a kiln and heated. Then, a layer of fluxes is applied to the core, and the kiln is heated further. The melting and sintering point of the core material, as well as the amount of flux added, will all influence the final ball shape and density.
Once the balls have been sintered and cooled, they are ready to be used in the furnace or vessel. The balls should be inspected carefully and placed in the correct position. In applications which involve a gas flow, the cold bonding balls should be arranged in an interconnected network, allowing the gas to flow through freely.
There are several advantages to using cold bonding balls. The main benefit is that they reduce costs by eliminating the need to use other preformed refractory products. Additionally, they are incredibly durable and can resist extreme temperatures and sudden changes in thermal conditions.
Overall, cold bonding balls are an effective and cost-efficient solution for containing and managing hot process gases. By sintering high-temperature materials into a compact shape, these balls are able to withstand the temperatures and sudden changes in thermal conditions, ensuring a safe and efficient working environment.
